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介绍了高速钢精锻材超声波检测中纵波径向周测以发现、确定材料内部缺陷、控制检测灵敏度等采用横孔人工缺陷作为RB试块的合理性，平底孔人工缺陷的局限性，以及高速钢精锻材材料内部的冶金缺陷特征
This paper introduces the rationality of using horizontal holes artificial defects as RB test blocks to find and determine the internal defects of materials and control the sensitivity of detection in the longitudinal inspection of the longitudinal waves in the ultrasonic inspection of the high-speed steel precision forging materials. The limitation of the artificial defects of the flat bottom holes, Characteristics of Metallurgical Defects Inside Steel Forging Material